Peel & coarsely chop the tomatoes & onions. Coarsely chop the zucchini & peppers. Combine in a bowl. Process in a food processor in several batches till they are finely chopped. Place in a large bowl, sprinkle with salt & let stand, covered, overnight.
Place vegetables in colander & drain excess liquid. Place in a large pot, add vinegar & sugar & stir over low heat till the sugar is dissolved. Bring to a boil & simmer for 3 minutes. Combine the remaining ingredients & blend till smooth. Add to the vegetables & bring to a boil, stirring constantly. Simmer till thickened. Remove from heat & pour into warm sterile jars. Seal.
